; The GIMP -- an image manipulation program
; Copyright (C) 1995 Spencer Kimball and Peter Mattis
; 
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
; 
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; GNU General Public License for more details.
; 
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
;
; Copyright (C) 1997 Andy Thomas alt@picnic.demon.co.uk
;
; Version 0.2 10.6.97 Changed to new script-fu interface in 0.99.10

; Delta the colour by the given amount. Check for boundary conditions
; If < 0 set to zero 
; If > 255 set to 255
; Return the new value

(define (deltacolour col delta)
  (let* ((newcol (+ col delta)))
    (if (< newcol 0) (set! newcol 0))
    (if (> newcol 255) (set! newcol 255))
    newcol)
  )

(define (adjcolour col delta)
  (mapcar (lambda (x) (deltacolour x delta)) col)
)

(define (gen_top_array xsize ysize owidth oheight width height)
  (let* ((n_array (cons-array 10 'double)))
    (aset n_array 0 0 )
    (aset n_array 1 0 )
    (aset n_array 2 xsize)
    (aset n_array 3 ysize)
    (aset n_array 4 (+ xsize owidth))
    (aset n_array 5 ysize)
    (aset n_array 6 width)
    (aset n_array 7 0 )
    (aset n_array 8 0 )
    (aset n_array 9 0 )
    n_array)
)

(define (gen_left_array xsize ysize owidth oheight width height)
  (let* ((n_array (cons-array 10 'double)))
    (aset n_array 0 0 )
    (aset n_array 1 0 )
    (aset n_array 2 xsize)
    (aset n_array 3 ysize)
    (aset n_array 4 xsize)
    (aset n_array 5 (+ ysize oheight))
    (aset n_array 6 0 )
    (aset n_array 7 height )
    (aset n_array 8 0 )
    (aset n_array 9 0 )
    n_array)
)

(define (gen_right_array xsize ysize owidth oheight width height)
  (let* ((n_array (cons-array 10 'double)))
    (aset n_array 0 width )
    (aset n_array 1 0 )
    (aset n_array 2 (+ xsize owidth))
    (aset n_array 3 ysize)
    (aset n_array 4 (+ xsize owidth))
    (aset n_array 5 (+ ysize oheight))
    (aset n_array 6 width)
    (aset n_array 7 height)
    (aset n_array 8 width )
    (aset n_array 9 0 )
    n_array)
)

(define (gen_bottom_array xsize ysize owidth oheight width height)
  (let* ((n_array (cons-array 10 'double)))
    (aset n_array 0 0 )
    (aset n_array 1 height)
    (aset n_array 2 xsize)
    (aset n_array 3 (+ ysize oheight))
    (aset n_array 4 (+ xsize owidth))
    (aset n_array 5 (+ ysize oheight))
    (aset n_array 6 width)
    (aset n_array 7 height)
    (aset n_array 8 0 )
    (aset n_array 9 height)
    n_array)
)

(define (script-fu-addborder aimg adraw xsize ysize colour dvalue)
  (let* ((img (car (gimp-drawable-get-image adraw)))
         (owidth (car (gimp-image-width img)))
         (oheight (car (gimp-image-height img)))
         (width (+ owidth (* 2 xsize)))
         (height (+ oheight (* 2 ysize)))
         (layer (car (gimp-layer-new img
                                     width height
                                     (car (gimp-drawable-type-with-alpha adraw))
                                     "Border-Layer" 100 NORMAL-MODE))))

;Add this for debugging    (verbose 4)

    (gimp-context-push)

    (gimp-image-undo-group-start img)

    (gimp-image-resize img
                       width
                       height
                       xsize
                       ysize)

    (gimp-image-add-layer img layer 0)
    (gimp-drawable-fill layer TRANSPARENT-FILL)

    (gimp-context-set-background (adjcolour colour dvalue))
    (gimp-free-select img
                      10
                      (gen_top_array xsize ysize owidth oheight width height)
                      CHANNEL-OP-REPLACE
                      0
                      0
                      0.0)
    (gimp-edit-fill layer BACKGROUND-FILL)
    (gimp-context-set-background (adjcolour colour (/ dvalue 2)))
    (gimp-free-select img
                      10
                      (gen_left_array xsize ysize owidth oheight width height)
                      CHANNEL-OP-REPLACE
                      0
                      0
                      0.0)
    (gimp-edit-fill layer BACKGROUND-FILL)
    (gimp-context-set-background (adjcolour colour (- 0 (/ dvalue 2))))
    (gimp-free-select img
                      10
                      (gen_right_array xsize ysize owidth oheight width height)
                      CHANNEL-OP-REPLACE
                      0
                      0
                      0.0)

    (gimp-edit-fill layer BACKGROUND-FILL)
    (gimp-context-set-background (adjcolour colour (- 0 dvalue)))
    (gimp-free-select img
                      10
                      (gen_bottom_array xsize ysize owidth oheight width height)
                      CHANNEL-OP-REPLACE
                      0
                      0
                      0.0)

    (gimp-edit-fill layer BACKGROUND-FILL)
    (gimp-selection-none img)
    (gimp-image-undo-group-end img)
    (gimp-displays-flush)

    (gimp-context-pop)))

(script-fu-register "script-fu-addborder"
                    _"Add _Border..."
                    "Add a border around an image"
                    "Andy Thomas <alt@picnic.demon.co.uk>"
                    "Andy Thomas"
                    "6/10/97"
                    "*"
                    SF-IMAGE       "Input image"          0
                    SF-DRAWABLE    "Input drawable"       0
                    SF-ADJUSTMENT _"Border X size"        '(12 1 250 1 10 0 1)
                    SF-ADJUSTMENT _"Border Y size"        '(12 1 250 1 10 0 1)
                    SF-COLOR      _"Border color"         '(38 31 207)
                    SF-ADJUSTMENT _"Delta value on color" '(25 1 255 1 10 0 1))

(script-fu-menu-register "script-fu-addborder"
                         "<Image>/Filters/Decor")
